Lifting Lab Ultimate Arm Builder | Flexible Occlusion Cuffs for Blood Flow Restriction Training We believe that the key to BFR training is using a wrap that has flexible fabric that can move with the muscle while maintaining optimal pressure on venous return Youll experience a whole new level of comfort when you feel the way our material expands and contracts around the muscle without restricting your movement Custom made metal buckles allow your free hand to find your preferred pressure without loosening up during training like wraps that rely on plastic buckles We'll send a six page starter guide on occlusion training to your inbox as soon as your order is confirmed Fully adjustable fit for any arm size - fabric runs 24" long, 1" wide, and 2mm thick. Fits perfectly in the crux between the deltoid and bicep/tricep without restricting movement Designed with comfort in mind, our premium flexible fabric lets you to feel the burn in the muscle, rather than on the skin Our metal buckleshelpyou easily find and KEEPthe optimal pressure for the perfect pump